Modified aliphatic superplasticizer and preparation method thereof

A high-efficiency water reducer, aliphatic technology, applied in the field of modified aliphatic high-efficiency water reducer and its preparation, can solve the problems of complex reaction mechanism and large performance difference of aliphatic high-efficiency water reducer, and achieve good application prospects, The effect of low cost and increased water reduction rate

Active Publication Date: 2013-05-22
NANJING RUIDI HIGH TECH
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AI Technical Summary

Problems solved by technology

The reaction mechanism of aliphatic high-efficiency superplasticizers is complex. Many monomers and process formulas can be used to synthesize aliphatic high-efficiency water-reducers. The performance of corresponding products is also very different. Although there have been many studies on its modification, but There is still a lot of room for modifying the performance of aliphatic high-efficiency water reducers by introducing new monomers

Method used

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preparation example Construction

[0033] (1) Preparation of modifier: Put 21 kg of acrylamide, 45 kg of sodium sulfite and 100 kg of water into the reaction kettle, and heat up to 50°C to dissolve; slowly add 44 kg of formaldehyde dropwise, and finish dropping in 1 hour, and control the temperature during the dropping process At 70±3°C; continue to keep warm for 3 hours after dripping; then cool and discharge to obtain light yellow transparent liquid, that is, sulfomethylated acrylamide modifier.

[0034] (2) Preparation of modified aliphatic water-reducer: add 150 kg of water and 100 kg of sodium sulfite to the reaction kettle, stir and dissolve; then add 58 kg of acetone dropwise, and finish dripping in half an hour; add 3 kg of sodium persulfate and 50 kg of water to make a trigger Add the solution to the reaction kettle; slowly add 65 kg of formaldehyde dropwise, control the dropping speed to maintain the temperature in the kettle not exceeding 55°C, and finish dropping in 2 to 5 hours; continue to add 150 ...

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Abstract

The invention relates to a modified aliphatic superplasticizer and a preparation method thereof. The prepared aliphatic superplasticizer has high water-reducing rate, small concrete slump loss and good cement adaptability. The preparation method of the modified aliphatic superplasticizer comprises the following steps of: (1) modifying agent preparation: dissolving acrylamide, sodium sulfite and water through heating, and slowly dripping formaldehyde in one hour; thermally insulating for 3 hours after the dripping is finished, cooling and discharging to obtain a sulfomethylation acrylamide modifying agent; (2) modified aliphatic superplasticizer preparation: stirring the sodium sulfite with water to dissolve; dripping acetone in half an hour; adding initiating agent solution which is prepared in advance; slowly dripping formaldehyde which accounts for about 1 / 3 of the total volume; then, quickly dripping the residual formaldehyde and the modifying agent, finishing the dripping in an hour, and continuously retaining heat for 2 hours; and finally, adding water to cool and discharging to obtain the brownish red liquid modified aliphatic superplasticizer.

Description

technical field [0001] The invention relates to a modified aliphatic high-efficiency water reducer and a preparation method thereof, belonging to the technical field of building materials. Background technique [0002] Concrete superplasticizers have become an important component of high-performance concrete. At present, in the domestic market, the high-efficiency water reducers are mainly naphthalene-based and polycarboxylic acid-based. The latter is mainly used in high-performance concrete such as passenger lines due to its high price. Water reducing agent, etc. The disadvantage of naphthalene-based superplasticizers is that the slump loss is large, and due to the high content of sodium sulfate, crystallization and precipitation are prone to occur in low-temperature environments, which seriously limits its use in winter; The price of water agent is high, it is sensitive to the dosage at low dosage, and it is incompatible with naphthalene-based water reducers, etc., which...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/16C08F283/00C04B103/30
Inventor 陈国新祝烨然黄国泓王冬沈燕平徐唯唯杨日付丹华王毅杜志芹刘兴荣蔡明
Owner NANJING RUIDI HIGH TECH
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